message-processor/main.spec.js

import { messageProcessor } from "./main.js";
import { jest } from '@jest/globals'

test('should fire error message with empty message', () => {
  console.error = jest.fn();
  var errorMessage = "Got mallformed message:";
  var errorParams = { action: undefined, data: undefined };

  messageProcessor.processMessage();
  expect(console.error).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should fire error message with empty string', () => {
  console.error = jest.fn();
  var errorMessage = "Got mallformed message:";
  var errorParams = { action: undefined, data: undefined };

  messageProcessor.processMessage("");
  expect(console.error).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should fire error message with null', () => {
  console.error = jest.fn();
  var errorMessage = "Got mallformed message:";
  var errorParams = { action: undefined, data: undefined };

  messageProcessor.processMessage(null);
  expect(console.error).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should fire error message with undefined', () => {
  console.error = jest.fn();
  var errorMessage = "Got mallformed message:";
  var errorParams = { action: undefined, data: undefined };

  messageProcessor.processMessage(undefined);
  expect(console.error).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should fire error message about mallformed message', () => {
  console.error = jest.fn();
  var message = {};
  var errorMessage = "Got mallformed message:";
  var errorParams = { action: undefined, data: undefined };

  messageProcessor.processMessage(message);
  expect(console.error).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should fire log message if no action presents', () => {
  console.log = jest.fn();
  var message = { action: "do something" };
  var errorMessage = "No actions for message:";
  var errorParams = { action: "do something", data: undefined };

  messageProcessor.processMessage(message);
  expect(console.log).toHaveBeenCalledWith(errorMessage, errorParams);
});

test('should call action', () => {
  var result = 0;
  var message = {
    action: "do something"
  };

  messageProcessor.actions = {
    "do something": function() {
      result = 1;
    }
  };

  messageProcessor.processMessage(message);
  expect(result).toBe(1);
});